JMS ignoring settings to send a message as non-persistent

Question

I'm trying to send a BUFFERED (as opposed to PERSISTENT) message using JMS. I
would expect the Oracle implementation of JMS to map the JMS
non-peristent delivery mode in the Oracle BUFFERED delivery mode.
However, try as I might JMS always sends messages as
persistent, sample below. Is there any way I can send a BUFFERED AQ message
using JMS?
import javax.jms.*;
import oracle.jms.*;
import oracle.xdb.*;
public class jmsbuftest
public static void main (String args [])
throws java.sql.SQLException, ClassNotFoundException, JMSException
try
String ora_sid = "***";
String host = "***";
String schema = "***";
String password = "***";
String queueName = "***";
int port = 1521;
Enqueue(ora_sid, host, schema, password, queueName, port);
System.out.println("You should see 3 messages in " + queueName.
They should be buffered but are persistent instead");
catch (Exception ex)
System.out.println("Exception: " + ex);
public static void Enqueue(String ora_sid, String host,
String schema, String password, String queueName, int port)
QueueConnectionFactory qc_fact = null;
QueueConnection q_conn = null;
QueueSession q_sess = null;
java.sql.Connection db_conn = null;
Queue queue = null;
AdtMessage adt_msg = null;
QueueSender q_sender = null;
oracle.xdb.XMLType xtype = null;
String data = null;
try
qc_fact = AQjmsFactory.getQueueConnectionFactory(host,
ora_sid, port, "thin");
q_conn = qc_fact.createQueueConnection(schema, password);
q_sess = q_conn.createQueueSession(true,
Session.CLIENT_ACKNOWLEDGE);
q_conn.start();
db_conn = ((AQjmsSession)q_sess).getDBConnection();
queue = ((AQjmsSession)q_sess).getQueue(schema, queueName);
q_sender = q_sess.createSender(queue);
adt_msg = ((AQjmsSession)q_sess).createAdtMessage();
data = "<bolek>olek</bolek>";
xtype = oracle.xdb.XMLType.createXML(db_conn, data);
adt_msg.setAdtPayload(xtype);
//try sending a buffered message, different ways, none of them
works!
((AQjmsQueueSender)q_sender).send(queue, adt_msg,
DeliveryMode.NON_PERSISTENT, 1,
AQjmsConstants.EXPIRATION_NEVER);
q_sender.setDeliveryMode(DeliveryMode.NON_PERSISTENT);
((AQjmsQueueSender)q_sender).send(queue, adt_msg,
DeliveryMode.NON_PERSISTENT, 1,
AQjmsConstants.EXPIRATION_NEVER);
adt_msg.setJMSDeliveryMode(DeliveryMode.NON_PERSISTENT);
((AQjmsQueueSender)q_sender).send(queue, adt_msg,
DeliveryMode.NON_PERSISTENT, 1,
AQjmsConstants.EXPIRATION_NEVER);
q_sess.commit();
q_sess.close();
q_conn.close();
catch (Exception e)
System.out.println("Exception: " + e);
}

Answer 1

I believe you need to use the Oracle specific methods with "buffer"in their name,
ie. (AQjmsProducer) bufferSend and (AQjmsProducer) bufferPublish. (Page 11-15 of Oracle® Streams Advanced Queuing User's Guide and Reference 10g Release 2 (10.2) )
So far I've been producing my buffered messages in PL/SQL. I'm receiving them using (AQjmsConsumer) .bufferReceive.
These require using the (now recommended) generic objects (not specific to Queue or Topic) ConnectionFactory, Connection, Session, MessageProducer.
I have tried to send buffered messages, and got close, but not got it to work. My core code is:
ConnectionFactory cfact = AQjmsFactory.getConnectionFactory(args[1], args[0], Integer.parseInt(args[2]), args[3]);
Connection conn = cfact.createConnection(SCHEMANAME, SCHEMAPWD); // user& password
// Send buffered probably needs non-transacted session
Session sess = conn.createSession(false, Session.DUPS_OK_ACKNOWLEDGE);
conn.start();
Queue queue = ((AQjmsSession)sess).getQueue(SCHEMANAME, QUEUENAME);
AQjmsProducer q_sender = (AQjmsProducer) sess.createProducer(queue);
q_sender.setDeliveryMode(DeliveryMode.NON_PERSISTENT);
TextMessage txtmsg = sess.createTextMessage();
txtmsg.setText("Cars Distribution");
txtmsg.setJMSType("glopt");
txtmsg.setJMSDeliveryMode(DeliveryMode.NON_PERSISTENT);
q_sender.bufferSend(queue, txtmsg, 1,600);
Unfortunately I get errors :
JMS-204: An error occurred in the AQ JNI layer
JMS-242: Illegal attempt to enqueue message with both immediate visibility and three phase enqueue process.
It looks like I need to set visibility immediate, but I don't know how to do that in JMS. The AQjmsProducer.bufferSend API documentation says "When the in-memory queue is used, the enqueue operation is required to be in immediate visibility mode"
The queue create for this example was:
exec DBMS_AQADM.DROP_QUEUE_TABLE('DBEVENTQ_TABLE', force => true);
begin DBMS_AQADM.CREATE_QUEUE_TABLE(
Queue_table => 'DBEVENTQ_TABLE',
Queue_payload_type => 'SYS.AQ$_JMS_TEXT_MESSAGE',
Multiple_consumers => FALSE,
message_grouping => DBMS_AQADM.NONE,
Compatible => '10.0'
end;
begin DBMS_AQADM.CREATE_QUEUE(
Queue_name => 'DBEVENTQ',
Queue_table => 'DBEVENTQ_TABLE',
Queue_type => DBMS_AQADM.NORMAL_QUEUE,
Max_retries => 5,
Retry_delay => 0,
retention_time => 0 /* dont retain messages */
end;
exec DBMS_AQADM.START_QUEUE ('DBEVENTQ');
If you get past this JMS-242: Illegal attempt to enqueue message with both immediate visibility and three phase enqueue process, please tell me.
Regards, David